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Expose vips_text to create an image containing rendered text (#3252)

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brahima
2022-07-25 12:32:10 +02:00
committed by GitHub
parent 76c4c51e2a
commit ea7cf2a2ef
12 changed files with 567 additions and 2 deletions
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89
lib/input.js
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@@ -4,6 +4,18 @@ const color = require('color');
const is = require('./is');
const sharp = require('./sharp');
/**
* Justication alignment
* @member
* @private
*/
const align = {
left: 'low',
center: 'centre',
centre: 'centre',
right: 'high'
};
/**
* Extract input options, if any, from an object.
* @private
@@ -245,6 +257,81 @@ function _createInputDescriptor (input, inputOptions, containerOptions) {
throw new Error('Expected valid width, height and channels to create a new input image');
}
}
// Create a new image with text
if (is.defined(inputOptions.text)) {
if (is.object(inputOptions.text) && is.string(inputOptions.text.text)) {
inputDescriptor.textValue = inputOptions.text.text;
if (is.defined(inputOptions.text.height) && is.defined(inputOptions.text.dpi)) {
throw new Error('Expected only one of dpi or height');
}
if (is.defined(inputOptions.text.font)) {
if (is.string(inputOptions.text.font)) {
inputDescriptor.textFont = inputOptions.text.font;
} else {
throw is.invalidParameterError('text.font', 'string', inputOptions.text.font);
}
}
if (is.defined(inputOptions.text.fontfile)) {
if (is.string(inputOptions.text.fontfile)) {
inputDescriptor.textFontfile = inputOptions.text.fontfile;
} else {
throw is.invalidParameterError('text.fontfile', 'string', inputOptions.text.fontfile);
}
}
if (is.defined(inputOptions.text.width)) {
if (is.number(inputOptions.text.width)) {
inputDescriptor.textWidth = inputOptions.text.width;
} else {
throw is.invalidParameterError('text.textWidth', 'number', inputOptions.text.width);
}
}
if (is.defined(inputOptions.text.height)) {
if (is.number(inputOptions.text.height)) {
inputDescriptor.textHeight = inputOptions.text.height;
} else {
throw is.invalidParameterError('text.height', 'number', inputOptions.text.height);
}
}
if (is.defined(inputOptions.text.align)) {
if (is.string(inputOptions.text.align) && is.string(this.constructor.align[inputOptions.text.align])) {
inputDescriptor.textAlign = this.constructor.align[inputOptions.text.align];
} else {
throw is.invalidParameterError('text.align', 'valid alignment', inputOptions.text.align);
}
}
if (is.defined(inputOptions.text.justify)) {
if (is.bool(inputOptions.text.justify)) {
inputDescriptor.textJustify = inputOptions.text.justify;
} else {
throw is.invalidParameterError('text.justify', 'boolean', inputOptions.text.justify);
}
}
if (is.defined(inputOptions.text.dpi)) {
if (is.number(inputOptions.text.dpi) && is.inRange(inputOptions.text.dpi, 1, 100000)) {
inputDescriptor.textDpi = inputOptions.text.dpi;
} else {
throw is.invalidParameterError('text.dpi', 'number between 1 and 100000', inputOptions.text.dpi);
}
}
if (is.defined(inputOptions.text.rgba)) {
if (is.bool(inputOptions.text.rgba)) {
inputDescriptor.textRgba = inputOptions.text.rgba;
} else {
throw is.invalidParameterError('text.rgba', 'bool', inputOptions.text.rgba);
}
}
if (is.defined(inputOptions.text.spacing)) {
if (is.number(inputOptions.text.spacing)) {
inputDescriptor.textSpacing = inputOptions.text.spacing;
} else {
throw is.invalidParameterError('text.spacing', 'number', inputOptions.text.spacing);
}
}
delete inputDescriptor.buffer;
} else {
throw new Error('Expected a valid string to create an image with text.');
}
}
} else if (is.defined(inputOptions)) {
throw new Error('Invalid input options ' + inputOptions);
}
@@ -504,4 +591,6 @@ module.exports = function (Sharp) {
metadata,
stats
});
// Class attributes
Sharp.align = align;
};